Chapter 02 The Chemistry of Biology
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1 Chapter 02 The Chemistry of Biology Multiple Choice Questions 1. Anything that occupies space and has mass is called A. atomic. B. living. C. matter. D. energy. E. space. Learning Outcome: Explain the relationship between atoms and elements. 2. The electrons of an atom are A. always equal to the number of neutrons in an atom. B. found in the nucleus. C. used to determine atomic number. D. positively charged. E. moving in pathways called orbitals. ASM Objective: Bacteria and Archaea exhibit extensive, and often unique, metabolic diversity (e.g., nitrogen fixation, methane production, anoxygenic photosynthesis). Learning Outcome: Explain the relationship between atoms and elements. 2-1 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
2 3. The electrons of an atom are A. always equal to the number of protons. B. used to determine the atomic weight. C. carrying a positive charge. D. used to determine the atomic number. E. always in full orbitals. Learning Outcome: Explain the relationship between atoms and elements. 4. All of the following pertain to the atom Carbon-14 except A. has 6 protons. B. has 6 electrons. C. has 14 neutrons. D. is an isotope of Carbon. Learning Outcome: Explain the relationship between atoms and elements. 5. The subatomic particles that surround the nucleus are the A. electrons. B. protons. C. neutrons. D. protons and neutrons. E. protons and electrons. 2-2 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
3 Learning Outcome: Explain the relationship between atoms and elements. 6. What is the maximum number of electrons in the second energy shell of an atom? A. 2 B. 4 C. 8 D. 18 E. 32 Learning Outcome: Explain the relationship between atoms and elements. 7. What is the maximum number of electrons in the first energy shell of an atom? A. 2 B. 4 C. 8 D. 18 E. 32 Learning Outcome: Explain the relationship between atoms and elements. 2-3 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
4 8. Protons and neutrons that make up the atom's central core, which is referred to as its A. valence number. B. isotope. C. nucleus. D. center of gravity. Learning Outcome: Explain the relationship between atoms and elements. 9. The valence number is the A. number of protons. B. number of neutrons. C. atomic weight. D. number of inner most electrons. E. number of outer most electrons. Learning Outcome: Explain the relationship between atoms and elements. 10. Two or more atoms bonded together are called a/an A. ion. B. isotope. C. element. D. electrolyte. E. molecule. 2-4 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
5 Learning Outcome: Explain the relationship between atoms and elements. 11. What would be the valence number of electrons in the sulfur (S) atom? A. 2 B. 6 C. 8 D. 16 E. 32 Learning Outcome: Explain the relationship between atoms and elements. 12. Polar molecules are composed of covalently bonded A. identical atoms. B. carbon atoms. C. ions. D. atoms of different electronegativity. E. atoms of identical electronegativity. ASM Objective: The growth of microorganisms can be controlled by physical, chemical, mechanical, or biological means. Learning Outcome: List and define four types of chemical bonds. 2-5 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
6 13. Polar molecules A. have an equal charge distribution. B. have an unequal charge distribution. C. are insoluble in water. D. always contain carbon. E. always involve oxygen. Learning Outcome: Explain the relationship between atoms and elements. 14. Covalent bonds A. result from losing electrons. B. are always polar. C. are always nonpolar. D. result from sharing electrons. E. result from gaining electrons. Learning Outcome: List and define four types of chemical bonds. 2-6 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
7 15. Cations are A. charged subatomic particles. B. atoms that have gained electrons. C. atoms that have gained neutrons. D. capable of forming ionic bonds with anions. E. atoms without protons. Learning Outcome: List and define four types of chemical bonds. 16. A reaction where an electron is lost is called A. oxidation. B. reduction. C. ionization. D. decomposition. E. dissolution. Learning Outcome: List and define four types of chemical bonds. 2-7 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
8 17. An atom has gained an electron. It has been A. oxidized. B. reduced. C. ionized. D. deionized. E. neutralized. Learning Outcome: Explain the relationship between atoms and elements. Learning Outcome: List and define four types of chemical bonds. 18. Ionic bonds A. result from sharing electrons. B. result from transferring electrons. C. result from like charge attraction. D. are the weakest chemical bonds. E. always involve carbon. Learning Outcome: List and define four types of chemical bonds. 2-8 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
9 19. Hydrogen bonds A. result from attractive forces between molecules with polar covalent bonds. B. result from attractive forces between molecules with polar ionic bonds. C. result from attractive forces between molecules with nonpolar covalent bonds. D. result from attractive forces between molecules with nonpolar ionic bonds. E. are the strongest bonds between molecules. Learning Outcome: List and define four types of chemical bonds. 20. Atoms that gain or lose electrons become charged particles called A. cations. B. anions. C. ions. D. isotopes. Learning Outcome: List and define four types of chemical bonds. 21. Substances that release ions when dissolved in water and conduct electricity are A. covalent. B. nonpolar. C. electrons. D. electrolytes. E. solvents. 2-9 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
10 ASM Objective: The growth of microorganisms can be controlled by physical, chemical, mechanical, or biological means. Learning Outcome: List and define four types of chemical bonds. Learning Outcome: Differentiate between a solute and a solvent. 22. Which of the following represents a synthesis reaction? A. AB A + B B. A + B AB C. AB + XY AY + XB D. AB + XY AY + XB Learning Outcome: List and define four types of chemical bonds. 23. Which of the following represents a reversible reaction? A. AB A + B B. A + B AB C. AB + XY AY + XB D. AB + XY AY + XB Learning Outcome: List and define four types of chemical bonds Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
11 24. The important solvent associated with living things is A. carbon dioxide. B. sodium chloride. C. ethyl alcohol. D. benzene. E. water. Learning Outcome: Differentiate between a solute and a solvent. 25. A capillary tube is used to acquire a small blood sample for CBC (complete blood count) analysis. Suction is not required to transfer the blood from the fingertip prick to the tube in part due to: A. ionic bonding between the water molecules. B. cohesive forces between the glass particles of the tube and the water molecules. C. covalent bonding between the water molecules. D. adhesive forces between the water molecules and the glass particles of the tube. Learning Outcome: Differentiate between a solute and a solvent Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
12 26. Ionic compounds A. are hydrophobic. B. are hydrophilic. C. are acidic in solution. D. are basic in solution. E. always form salts in solution. Learning Outcome: List and define four types of chemical bonds. 27. A solution is composed of one or more substances called that are uniformly dispersed in a dissolving medium called a. A. solvents; solute B. solutes; solvent C. neither solvents, solute nor solutes; solvent D. both solvents, solute and solutes; solvent Learning Outcome: Differentiate between a solute and a solvent Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
13 28. Which term or phrase does not belong in this list of characteristics describing acids? A. lactic acid B. vinegar C. hydrogen ion donor D. ph 8 E. acidic Learning Outcome: Provide a brief definition of ph. 29. Compared to a solution of ph 9, a solution of ph 7: A. is more basic. B. has no OH - ions. C. has more H + ions. D. has a higher ph. Learning Outcome: Provide a brief definition of ph. 30. Burning coal produces sulfur dioxide in the atmosphere. When combined with precipitation that falls into bodies of water, this leads to: A. an increase in ph level of the water. B. a greater concentration of OH - ions in the water. C. a decrease in the ph level of the water. D. no change in the ph level of the water Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
14 Learning Outcome: Provide a brief definition of ph. 31. Compared to a solution of ph 9, a solution of ph 7 is: A. 2 times more acidic. B. 20 times more acidic. C. 20 times more basic. D. 100 times more acidic. E. 100 times more basic. Learning Outcome: Provide a brief definition of ph. 32. Which of the following functional groups is mismatched to the organic compound in which it is typically contained? A. phosphate - carbohydrates B. sulfhydryl - proteins C. amino - proteins D. hydroxyl - alcohols E. carboxyl - fatty acids 2-14 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
15 33. Organic chemicals always have a basic framework of the element bonded to other atoms. A. carbon B. nitrogen C. oxygen D. hydrogen E. phosphorous Learning Outcome: Explain the relationship between atoms and elements. 34. Most biochemical macromolecules are polymers, which are chains of A. hydrophobic molecules. B. electrolytic molecules. C. repeating monomers. D. repeating carbohydrates. E. hydrogen bonds Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
16 35. All of the following are monosaccharides except A. glucose. B. glycogen. C. fructose. D. ribose. E. deoxyribose. 36. Which of the following would have glycosidic bonds? A. triglycerides B. monosaccharides C. polypeptides D. polysaccharides E. ATP 2-16 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
17 37. All of the following are polysaccharides except A. dextran in some bacterial slime layers. B. agar used to make solid culture media. C. a cell's glycocalyx. D. cellulose in certain cell walls. E. sterols in cell membranes. Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. 38. C6H12O6 + C6H12O6 C12 H22O11 + H2O represents A. the formation of a peptide bond. B. a decomposition reaction. C. a denaturation reaction. D. the formation of a polysaccharide. E. a dehydration synthesis. Learning Outcome: Explain the relationship between atoms and elements Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
18 39. Starch is the primary storage food for all of the following except A. green plants. B. algae. C. animals. D. some fungi. 40. Select the statement that most accurately reflects the process of plant material digestion in humans: A. it is a very efficient process the produces very little undigested material in feces. B. it is a process that is dependent upon enzyme (cellulase) production by gut microbiota. C. it requires the action of enzymes called kinases. D. it is linked to the digestion of glycogen. 41. All of the following are lipids except A. cholesterol. B. starch. C. phospholipid. D. wax. E. triglyceride Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
19 42. What part of a phospholipid comprise the hydrophobic tails? A. fatty acids B. glycerol C. phosphate D. alcohol E. hydroxyl Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
20 43. A fat is called if all carbons of the fatty acid chain are single-bonded to 2 other carbons and 2 hydrogens. A. unsaturated B. polyunsaturated C. monounsaturated D. saturated 44. The lipid group that serves as energy storage molecules is the A. prostaglandins. B. waxes. C. phospholipids. D. steroids. E. triglycerides. ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: Provide examples of cell components made from each of the families of biochemicals Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
21 45. The lipid group that is the major component of cell membranes is the A. prostaglandins. B. waxes. C. phospholipids. D. steroids. E. triglycerides. ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. 46. The building blocks of an enzyme are A. nucleotides. B. glycerol and fatty acids. C. monosaccharides. D. phosphate, glycerol, and fatty acids. E. amino acids. ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. 47. An amino acid contains all of the following except a/n A. amino group. B. carboxyl group. C. variable R group. D. carbon. E. phosphate Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
22 ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. 48. Which is not true about enzymes? A. found in all cells B. are catalysts C. participate in the cell's chemical reactions D. can be denaturated by heat and other agents E. have high-energy bonds between phosphates ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: Differentiate among primary, secondary, tertiary, and quaternary levels of protein structure. 49. What type of bonds are formed by dehydration synthesis between adjacent amino acids? A. glycosilic B. ester C. peptide D. disulfide E. phosphate ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: Provide examples of cell components made from each of the families of biochemicals Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
23 50. The alpha ( ) helix is a type of protein structure. A. primary B. secondary C. tertiary D. quaternary ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: Differentiate among primary, secondary, tertiary, and quaternary levels of protein structure. 51. One nucleotide contains one A. phosphate. B. pentose sugar. C. nitrogen base. D. All of the choices are correct. ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. Learning Outcome: List the three components of nucleotides. 52. Which pertains to DNA but not to RNA? A. contains ribose B. contains adenine C. contains thymine D. contains uracil E. contains nucleotides ASM Objective: Although the central dogma is universal in all cells, the processes of replication, transcription, and translation differ in Bacteria, Archaea, and Eukaryotes Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
24 ASM Topic: Module 04 Information Flow Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. Learning Outcome: Name the nitrogen bases of DNA and of RNA. 53. ATP is best described as A. an enzyme. B. a double helix. C. an electron carrier. D. the energy molecule of cells. ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: List the three components of ATP. 54. A student forgot to label a beaker containing a DNA solution and a beaker containing a glucose solution. If chemical analysis was performed to identify the contents of each beaker, which of the following would be found in the beaker of DNA but not in the beaker with glucose? A. amino acids B. hydrogen and oxygen atoms C. nitrogen and phosphorus D. fatty acids E. carbon atoms ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. Learning Outcome: Name the nitrogen bases of DNA and of RNA Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
25 55. Purines and pyrimidines are components in the building block units of all A. nucleic acids. B. carbohydrates. C. polysaccharides. D. amino acids. E. enzymes. ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics. Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. Learning Outcome: List the three components of nucleotides. 56. Which of the following is not a pyrimidine? A. uracil B. adenine C. thymine D. cytosine ASM Objective: Although the central dogma is universal in all cells, the processes of replication, transcription, and translation differ in Bacteria, Archaea, and Eukaryotes. ASM Topic: Module 04 Information Flow Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. Learning Outcome: Name the nitrogen bases of DNA and of RNA. Learning Outcome: List the three components of ATP Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
26 57. During protein synthesis, RNA is made to be a copy of a gene from the DNA that will be translated into protein. A. transfer B. messenger C. ribosomal D. small subunit ASM Objective: Although the central dogma is universal in all cells, the processes of replication, transcription, and translation differ in Bacteria, Archaea, and Eukaryotes. ASM Topic: Module 04 Information Flow Learning Outcome: Name the nitrogen bases of DNA and of RNA. 58. Characteristics shared by all cells include A. a membrane serving as a cell boundary. B. the possession of genetic information. C. the presence of cellular fluid. D. All of the choices are correct. ASM Objective: While microscopic eukaryotes (for example, fungi, protozoa, and algae) carry out some of the same processes as bacteria, many of the cellular properties are fundamentally different. ASM Topic: Module 02 Structure and Function Learning Outcome: Recall three characteristics common to all cells Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
27 59. Microscopic analysis of a cell reveals the presence of ribosomes. Based upon this information alone, it can be determined that: A. it is a bacterial cell. B. it is an archaeal cell. C. it is a eukaryotic cell. D. it is either a bacterial or archaeal cell. E. further information is needed to determine if it is either a bacterial, archaeal, or eukaryotic cell. ASM Objective: While microscopic eukaryotes (for example, fungi, protozoa, and algae) carry out some of the same processes as bacteria, many of the cellular properties are fundamentally different. ASM Topic: Module 02 Structure and Function Learning Outcome: Recall three characteristics common to all cells. 60. An example of an amphipathic molecule found in living cells is A. glucose. B. phospholipid. C. protein. D. nucleic acids. E. ATP. ASM Objective: The survival and growth of any microorganism in a given environment depends on its metabolic characteristics Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
28 61. The purine always binds with the pyrimidine within both DNA and RNA. A. guanine; cytosine B. cytosine; guanine C. adenine; guanine D. thymine; guanine ASM Objective: Although the central dogma is universal in all cells, the processes of replication, transcription, and translation differ in Bacteria, Archaea, and Eukaryotes. ASM Topic: Module 04 Information Flow Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. True / False Questions 62. Electrons that participate in chemical bonding are typically located closest to the nucleus. FALSE Learning Outcome: Explain the relationship between atoms and elements. 63. Water molecules are nonpolar molecules. FALSE Learning Outcome: List and define four types of chemical bonds Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
29 64. Polar molecules have more reactivity compared to nonpolar molecules. TRUE Learning Outcome: List and define four types of chemical bonds. 65. A covalent bond is formed between an anion and a cation. FALSE Learning Outcome: List and define four types of chemical bonds. 66. The concentration of a solution expresses the amount of solvent present. FALSE Learning Outcome: Differentiate between a solute and a solvent. 67. If solution A has a lower ph compared to solution B, then solution A is more acidic than solution B. TRUE 2-29 Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
30 ASM Topic: Module 05 Systems Learning Outcome: Provide a brief definition of ph. 68. The only part of an amino acid that differs from other amino acids is its R group. TRUE Learning Outcome: Provide examples of cell components made from each of the families of biochemicals. 69. All proteins are enzymes. FALSE Learning Outcome: Differentiate among primary, secondary, tertiary, and quaternary levels of protein structure. 70. The most important outcome of polypeptide intrachain bonding and folding is the unique shape of the protein. TRUE Learning Outcome: Differentiate among primary, secondary, tertiary, and quaternary levels of protein structure Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
31 71. Nucleic acids have primary, secondary, tertiary, and quaternary levels of organization. FALSE ASM Objective: Although the central dogma is universal in all cells, the processes of replication, transcription, and translation differ in Bacteria, Archaea, and Eukaryotes. ASM Topic: Module 04 Information Flow Blooms Level: 3. Apply Learning Outcome: List the three components of nucleotides. Learning Outcome: Name the nitrogen bases of DNA and of RNA. 72. A new organism was identified that contained arsenic in place of phosphate in its DNA double helix structure. Based upon this information alone, it can be determined that this change will greatly alter the information encoded by this genetic material. FALSE ASM Objective: Although the central dogma is universal in all cells, the processes of replication, transcription, and translation differ in Bacteria, Archaea, and Eukaryotes. ASM Topic: Module 04 Information Flow Blooms Level: 3. Apply Learning Outcome: List the three components of nucleotides. Learning Outcome: Name the nitrogen bases of DNA and of RNA. 73. Viruses are not considered living organisms because they lack cellular structure and require a host cell for life cycle completion. FALSE ASM Objective: Although the central dogma is universal in all cells, the processes of replication, transcription, and translation differ in Bacteria, Archaea, and Eukaryotes. ASM Objective: The synthesis of viral genetic material and proteins is dependent on host cells. ASM Topic: Module 04 Information Flow Blooms Level: 3. Apply Learning Outcome: Recall three characteristics common to all cells Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
32 Multiple Choice Questions 74. In what way would life be different if the element carbon was absent? A. There would be no organic compounds. B. There would be no inorganic compounds. C. Life would not exist in any shape or form. D. The concept of ph would not exist. Blooms Level: 3. Apply 75. In a later chapter, you will study the staining of bacteria. In the Gram stain, alcohol is used as a decolorizer. What chemical component of the cell does alcohol affect? A. protein B. carbohydrate C. lipid D. electrolytes Blooms Level: 3. Apply Learning Outcome: Provide examples of cell components made from each of the families of biochemicals Copyright 2015 All rights reserved. No reproduction or distribution without the prior written consent of
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